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Each ball number is printed 12 times on the draw balls. One of the numbers printed on the number "9" ball was incorrectly underlined as "6".

It says it will now pay out on combinations of numbers containing both "6" and "9". It could cost the lottery up to €54,000, as it pays out on both combinations.

If you had a winning combination of the following numbers - 3, 9, 23, 39, 40, 42 Bonus 10 - you can collect your winnings in the usual way.

If you had a winning combination of the following numbers - 3, 6, 23, 39, 40, 42 Bonus 10 - you can collect your winnings by signing the back of your ticket and posting it, with your name, address and telephone number, to Lotto Plus 2, National Lottery, Abbey Street Lower, Dublin 1.

The National Lottery confirmed this evening that the set of balls containing the misprinted ball was used eight times since it was introduced in January 2013.

The problem "9" ball, which also contained one "6", has been drawn once in that time.

Asked if this means that other customers have missed out on winnings, the Lotto spokesperson insisted that the ball was indeed the "9" ball and therefore there was no issue.

KPMG inspects all sets of balls before each draw by weighing them and checking the condition.

The Lotto spokesperson had no comment to make on whether KPMG had questions to answer.

When asked about the two graphics issues contained in last Saturday's televised draw, the spokesperson said this was a studio error within RTÉ.